Sentinel Island

Sentinel Island may refer to:


 * Sentinel Island (Tasmania), Australia
 * Sentinel Island (Alaska), location of the Sentinel Island Light lighthouse
 * Sentinel Island (Washington), one of the San Juan Islands, U.S.
 * North Sentinel Island, part of the Andaman Islands, India, and home to the isolated Sentinelese
 * South Sentinel Island, part of the Andaman Islands, India